JP7229966B2 - shoulder belt and bag - Google Patents

Description

The present invention relates to shoulder belts and bags.

In order to reduce the load on the shoulders, attempts have been made to increase the contact area between the shoulder belt and the shoulders, disperse the load, and reduce the pressure.

In Japanese Patent Laid-Open No. 2001-17227, in order to make the shoulder belt follow a complicated three-dimensional shape of the body, in the cross section of the shoulder belt in the longitudinal direction, both ends including a core material and between both ends including a belt-like tape are disclosed. A shoulder belt has been proposed that includes a central portion connecting the Further, Japanese Patent Application Laid-Open No. 2001-17227 discloses that a strong material such as polypropylene is used for the belt-shaped tape in order to bear the strength of the shoulder belt.

Japanese Patent Application Laid-Open No. 2001-17227

The shoulder belt is passed through the shoulder belt and can follow the three-dimensional shape of the wearer's body and distribute the load when the wearer's shoulders and arms are in a static state with the arms lowered and not moving. On the other hand, when the wearer's shoulders and arms are in a dynamic state, such as when the arm is raised and lowered, the contact area between the shoulder belt and the shoulder may become smaller due to the inability to sufficiently follow the change in the three-dimensional shape. was there.

As a result of research by the present inventors, it was thought that the reason for this is that the central portion including the band-shaped tape has high rigidity, so that both end portions and the central portion tend to be flat and that there is little expansion and contraction.

The main object of the present invention is to maintain the contact area between the shoulder belt and the shoulder when the wearer's shoulders and arms are in a dynamic state, such as raising and lowering the arm, as compared with conventional shoulder belts. To provide a shoulder belt and a bag equipped with the shoulder belt.

A shoulder belt according to the present invention is a shoulder belt having a longitudinal direction and a lateral direction intersecting the longitudinal direction. and a second part; and a third part connecting between the first part and the second part. The expansion ratio of the third part is higher than that of each of the first part and the second part. The bending resistance of the third part is lower than the bending resistance of each of the first part and the second part.

In the shoulder belt, each of the first portion and the second portion extends along the longitudinal direction. The third portion extends longitudinally between one end and the other end of each of the first and second portions.

In the shoulder belt, each of the first portion, the second portion, and the third portion extends between one end and the other end in the longitudinal direction of the shoulder belt.

In the above shoulder belt, the third part includes a first part arranged inside the first part and connected to the first part, and a first part arranged inside the second part and connected to the second part. and a third portion located external to the first and second portions and connecting the first and second portions. Each of the first part and the second part includes a core material arranged so as to overlap at least a part of the first part or the second part in a plan view, and the first part or the second part and the core in a cross section. A wrap disposed around the material and secured to the first portion or the second portion.

A bag according to the present invention includes the above-described shoulder belt, and body storage portions fixed to one longitudinal end and the other longitudinal end of the shoulder belt. The bag is, for example, a backpack or a golf bag.

According to the present invention, compared to conventional shoulder belts, a shoulder that does not impair the contact area between the shoulder belt and the shoulder even when the wearer's shoulders and arms are in a dynamic state, such as when raising and lowering the arm. A belt and a bag with the shoulder belt can be provided.

1 is a front view of a shoulder belt according to an embodiment; FIG. It is a rear view of the shoulder belt which concerns on this Embodiment. FIG. 2 is a cross-sectional view seen from arrows III-III in FIG. 1; It is a figure which shows the backpack which is an example of the bag provided with the shoulder belt which concerns on this Embodiment. FIG. 4 is a diagram showing a golf bag, which is another example of a bag provided with shoulder belts according to the present embodiment; FIG. 4 is a schematic diagram for explaining the neck side point and the acromion point of the wearer and the inclination angles of the neck side point and the acromion point with respect to the horizontal plane. FIG. 4 is a schematic diagram showing the state of contact between the shoulders and the first and second portions of the shoulder belt according to the present embodiment when the angles of inclination of the neck side point and the acromion point with respect to the horizontal plane are relatively small (so-called anchor shoulder); be. FIG. 4 is a schematic diagram showing the state of contact between the shoulders and the first and second portions of the shoulder belt according to the present embodiment when the angles of inclination of the neck side point and the acromion point with respect to the horizontal plane are relatively large (so-called sloping shoulders); be. Figure 9 shows the load distribution on the shoulder, measured with a flexible piezoelectric sensor for the case shown in Figure 8; FIG. 9 is a three-dimensional representation of the load distribution on the shoulder measured using the flexible piezoelectric sensor in the case shown in FIG. 8 ; A first state (P1) in which the arm is lowered, a second state (P2) in which the arm is raised horizontally, and a third state (P3) in which the arm is raised vertically. It is a figure for explaining. FIG. 12 is a diagram showing the distance between the neck side point and the acromion point in the first state shown in FIG. 11; FIG. 12 is a diagram showing the distance between the neck side point and the acromion point in the second state shown in FIG. 11; FIG. 12 is a diagram showing the distance between the neck side point and the acromion point in the third state shown in FIG. 11; FIG. 5 is a diagram for explaining how the shoulder belt is deformed in a state where the wearer raises his or her arm passed through the shoulder belt according to the present embodiment so as to extend in the horizontal direction; FIG. 5 is a diagram for explaining how the shoulder belt is deformed in a state where the wearer raises his/her arm passed through the shoulder belt according to the present embodiment in a vertical direction; FIG. 10 is a schematic diagram showing the state of contact between the shoulders and the outer and inner sides of the shoulder belt according to the comparative example when the inclination angles of the neck side point and the acromion point with respect to the horizontal plane are relatively small (so-called anchor shoulder). FIG. 10 is a schematic diagram showing the state of contact between the outer and inner sides of the shoulder belt according to the comparative example and the shoulders when the inclination angles of the neck side point and the acromion point with respect to the horizontal plane are relatively large (so-called sloping shoulders). Figure 19 shows the load distribution on the shoulder, measured with a flexible piezoelectric sensor for the case shown in Figure 18; FIG. 19 is a three-dimensional representation of the load distribution on the shoulder measured using the flexible piezoelectric sensor in the case shown in FIG. 18;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings below, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated.

The shoulder belt according to the present embodiment is attached to a bag and passed through the wearer's shoulders and arms. The shoulder belt 10L shown in FIGS. 1 and 2 is passed through the left arm, shoulder and chest of the wearer in the shoulder bag 100 shown in FIG. In the shoulder bag 100 shown in FIG. 4, the shoulder belt 10R through which the wearer's right arm, shoulder and chest are passed is symmetrical with the shoulder belt 10L. Hereinafter, in the shoulder belt 10L, the outside of the bag 100 shown in FIG. 4 is the front side, the opposite side is the back side, the front side is the front side, and the back side is the back side.

As shown in FIGS. 1 and 2, the shoulder belt 10L has a longitudinal direction and a lateral direction intersecting the longitudinal direction.

As shown in FIGS. 1 to 3, the shoulder belt 10L has a first portion 1, a second portion 2 and a third portion 3. As shown in FIGS. Each of the first portion 1 and the second portion 2 extends along the longitudinal direction. The third portion 3 extends between one end and the other end of each of the first portion 1 and the second portion 2 in the longitudinal direction. In other words, the third part 3 blocks the space between the first part 1 and the second part 2 .

As shown in FIG. 3, in a cross section that intersects the longitudinal direction, the first part 1 and the second part 2 are spaced apart from each other in the lateral direction. A third part 3 connects between the first part 1 and the second part 2 . The first part 1 is arranged outside the third part 3 in the bag 100 shown in FIG. The second part 2 is arranged inside the third part 3 in the bag 100 shown in FIG. The third part 3 is arranged between the first part 1 and the second part 2 in the bag 100 shown in FIG.

The expansion ratio of the third part 3 is higher than that of each of the first part 1 and the second part 2 . Here, each expansion ratio of the first part 1, the second part 2, and the third part 3 is the extension elastic modulus defined in the JIS standard (JIS L 1096: 2010), for example, It is measured based on the B-1 method (constant load method).

The flexibility of the third part 3 is higher than the flexibility of each of the first part 1 and the second part 2 . That is, the third part 3 is softer than each of the first part 1 and the second part 2 . The flexibility of each of the first part 1, the second part 2, and the third part 3 is, for example, the bending resistance specified in the JIS standard (JIS L 1096: 2010), for example, A method (45° cantilever method). That is, the bending resistance of the third part 3 is lower than the bending resistance of each of the first part 1 and the second part 2 .

As shown in FIGS. 1 and 2, the shoulder belt 10L is divided into, for example, a first region 11, a second region 12, a third region 13, and a fourth region 14 in the longitudinal direction. The first area 11 is connected to the second area 12 via the third area 13 . The fourth region 14 is arranged on the side opposite to the third region 13 with respect to the second region 12 and is connected to the second region 12 . In other words, the first region 11, the third region 13, the second region 12, and the fourth region 14 are connected in this order. Each of the first portion 1, the second portion 2, and the third portion 3 extends from the first region 11 to the second region 12 in the longitudinal direction of the shoulder belt 10L.

The first area 11 is an area that is expected to come into contact with the wearer's shoulders and upper chest when the bag 100 shown in FIG. 4 is worn. The second region 12 is a region intended to come into contact with the wearer's flank when the bag 100 shown in FIG. 4 is worn. The third region 13 is a region intended to come into contact with the wearer's lower chest and flanks when the bag 100 shown in FIG. 4 is worn. A connecting member 5 that is connected to a tape 102 fixed to the lower back surface of the main body storage portion 101 of the bag 100 shown in FIG. 4 is fixed to the fourth region 14 .

The basic configurations of each of first region 11, second region 12, and third region 13 are the same. Each of first part 1, second part 2 and third part 3 is arranged in first area 11, second area 12 and third area 13 respectively. In other words, in each of the first region 11, the second region 12, and the third region 13, the basic configurations of the first part 1, the second part 2, and the third part 3 are the same as each other. .

In first region 11 , each of first portion 1 , second portion 2 , and third portion 3 extends along the longitudinal direction of first region 11 . In second region 12 , each of first portion 1 , second portion 2 , and third portion 3 extends along the longitudinal direction of second region 12 . The longitudinal direction of the first region 11 and the longitudinal direction of the second region 12 are along the longitudinal direction of the shoulder belt 10L. The lateral direction of the first region 11 and the lateral direction of the second region 12 are along the lateral direction of the shoulder belt 10L.

The longitudinal direction of the first region 11 is set so as to form a gentle bend with respect to the longitudinal direction of the second region 12 . In other words, the shoulder belt 10L has a bent portion in plan view.

The longitudinal length of the second region 12 is shorter than the longitudinal length of the first region 11 and longer than the longitudinal length of the third region 13 . The width of the third region 13 in the transverse direction is preferably equal to or narrower than the maximum width W1 in the transverse direction of the first region 11 and wider than the minimum width W2 in the transverse direction of the second region 12 .

It is desirable that the width W3 of the third portion 3 in the first region 11 in the lateral direction is equal to or greater than the width W3 in the lateral direction of the third portion 3 in the second region 12 .

In one example of the shoulder belt 10L, the maximum width W1 of the first region 11 in the width direction is 50 mm or more and 90 mm or less, the minimum width W2 of the second region 12 in the width direction is 30 mm or more and 70 mm or less. The width W3 in the direction is preferably 5 mm or more and 15 mm or less.

As shown in FIGS. 1 to 3, each of the first part 1 and the second part 2 is constructed as an assembly of a plurality of members, for example.

As shown in FIG. 3, the third part 3 comprises a first part 3a arranged inside the first part 1 and connected to the first part 1, and a first part 3a arranged inside the second part 2. a second portion 3b which is connected to and connected to the second portion 2; and a third portion 3c. In the third part 3, only the third part 3c is exposed.

As shown in FIG. 3, the first part 1 has a core material 1a and a wrapping material 1b. The core material 1a is arranged so as to overlap at least a portion of the first portion 3a of the third portion 3 in plan view. The wrapping material 1b is arranged so as to surround the first portion 3a and the core material 1a in a cross section perpendicular to the longitudinal direction, and is fixed to the first portion 3a. The packaging material 1b has, for example, a surface portion 1b1, a back surface portion 1b2, and an outer edge portion 1b3. Note that the packaging material 1b may not have the outer edge portion 1b3. The surface portion 1b1 is arranged on the core material 1a side with respect to the first portion 3a in the cross section. The back surface portion 1b2 is arranged on the side opposite to the core material 1a with respect to the first portion 3a in the cross section. The outer edge portion 1b3 is arranged outside the first portion 3a of the third portion 3, the core material 1a, the surface portion 1b1, and the back surface portion 1b2 in the cross section. The first portion 3a, the surface portion 1b1, and the outer edge portion 1b3 of the third portion 3 are arranged so as to surround the core material 1a.

As shown in FIG. 3, the first portion 3a, the core material 1a, the surface portion 1b1, the back surface portion 1b2, and the outer edge portion 1b3 of the third portion 3 are sewn together by, for example, a sewing member 6a. The sewing member 6a sews, for example, the outer portion of each of the first portion 3a, the core material 1a, the surface portion 1b1, and the back portion 1b2, and the inner portion of the outer edge portion 1b3. Further, the first portion 3a, the front surface portion 1b1, and the rear surface portion 1b2 of the third portion 3 are sewn together by, for example, a sewing member 7a. The sewing member 7a sews, for example, the inner portions of each of the first portion 3a, the surface portion 1b1, and the back surface portion 1b2.

As shown in FIG. 3, the second part 2 has a substantially line-symmetrical relationship with the first part 1 with respect to the third part 3c of the third part 3, for example, in the cross section. In addition, the second part 2 does not have to be substantially line-symmetrical with the first part 1 with respect to the third part 3c of the third part 3 in the cross section. For example, the widths of the first portion and the second portion in the transverse direction may be different from each other.

As shown in FIG. 3, the second part 2 has a core material 2a and a wrapping material 2b. The core material 2a is arranged so as to overlap at least a portion of the second portion 3b of the third portion 3 in plan view. The wrapping material 2b is arranged so as to surround the second portion 3b and the core material 2a in a cross section perpendicular to the longitudinal direction, and is fixed to the second portion 3b. The packaging material 2b has, for example, a surface portion 2b1, a back surface portion 2b2, and an outer edge portion 2b3. Note that the packaging material 2b may not have the outer edge portion 2b3. The surface portion 2b1 is arranged on the core material 2a side with respect to the second portion 3b in the cross section. The back surface portion 2b2 is arranged on the side opposite to the core material 2a with respect to the second portion 3b in the cross section. The outer edge portion 2b3 is arranged outside the second portion 3b of the third portion 3, the core material 2a, the surface portion 2b1, and the back surface portion 2b2 in the cross section. The second portion 3b, the surface portion 2b1, and the outer edge portion 2b3 of the third portion 3 are arranged so as to surround the core material 2a.

As shown in FIG. 3, the second portion 3b, the core material 2a, the surface portion 2b1, the back surface portion 2b2, and the outer edge portion 2b3 of the third portion 3 are sewn together by, for example, a sewing member 6b. The sewing member 6b sews, for example, the outer portions of the second portion 3b, the core material 2a, the surface portion 2b1, and the back surface portion 2b2, and the inner portion of the outer edge portion 2b3. Further, the second portion 3b, the surface portion 2b1, and the back surface portion 2b2 of the third portion 3 are sewn together by, for example, a sewing member 7b. The sewing member 7b sews, for example, the inner portions of the second portion 3b, the surface portion 2b1, and the back surface portion 2b2.

In one example of the shoulder belt 10L, the material forming the third portion 3 includes at least one selected from the group consisting of mesh, air mesh, knit, and stretch material. The material constituting the core material 1a includes at least one selected from the group consisting of EPE, EVA, and sponge. The material forming the packaging material 1b includes at least one selected from the group consisting of PU, polyester, nylon, cotton, acrylic and TPU. In addition, the plurality of members included in each of the first part 1 and the second part 2 may be fixed to each other by any method such as adhesion without being limited to sewing.

As shown in FIG. 4, the bag 100 having the shoulder belt 10L is configured as, for example, a backpack. As shown in FIG. 4, the bag 100 includes a shoulder belt 10L, a shoulder belt 10R, and a body storage section 101 shown in FIGS. A first region 11 of the shoulder belt 10L is connected to the upper portion of the body storage portion 101 . The connecting member 5 of the shoulder belt 10L is connected to the tape 102 fixed to the lower part of the body storage portion 101. As shown in FIG. For example, the connecting member 5 of the shoulder belt 10L is passed through a tape 102 fixed to the lower portion of the body storage portion 101. As shown in FIG. Preferably, the connecting member 5 and the tape 102 are provided so as to adjust the length between one end of the tape 102 fixed to the main housing portion 101 and the portion passed through the connecting member 5 .

Although the shoulder belts 10L and 10L shown in FIGS. 1 to 4 have bent portions in plan view, the shoulder belts according to the present embodiment may not have bent portions in plan view. .

FIG. 5 shows a bag 110 having shoulder belts 10 that do not have bent portions in plan view. The shoulder belt 10 has basically the same configuration as the shoulder belt 10L, but differs from the shoulder belt 10L in that it does not have a bent portion in plan view. The bag 110 is configured as, for example, a golf bag.

Next, functions and effects of the shoulder belts 10L, 10R, 10 according to the present embodiment will be described. First, referring to FIGS. 6 to 10, the effects of the shoulder belts 10L, 10R, 10 when the wearer's shoulders and arms are in a static state are compared with the comparative example shown in FIGS. 17 to 19. will be described based on the comparison.

The shoulder belts 10L, 10R, 10 are expected to contact at least a part of the region located between the neck side point and the acromion point of the wearer shown in FIG. The third part 3 is intended to be arranged so as to overlap a part of the region located between the cervical point and the acromion point of the wearer.

The angle of inclination formed by the virtual line segment connecting the neck point and the acromion point with respect to the horizontal plane and the distance between the neck point and the acromion point differ from wearer to wearer.

The shoulder belt according to the comparative example shown in FIGS. 17 and 18 does not have the third portion 3 . In the shoulder belt according to the comparative example, the elastic ratios of the outer and inner sides are the same as the elastic ratios of both ends in the lateral direction. In the shoulder belt according to the comparative example, the flexibility of the central portion in the width direction is the same as the flexibility of both ends in the width direction. As shown in FIG. 17, when the shoulder belt according to the comparative example is worn by a wearer with a relatively small inclination angle, that is, a so-called anchor shoulder, the lateral end of the shoulder belt is in the vicinity of the neck side point. Easy to touch only parts. Therefore, the load of the bag is likely to be concentrated in the vicinity of the neck point. Further, as shown in FIG. 18, when the shoulder belt according to the comparative example is worn by a wearer with a relatively large angle of inclination, that is, a so-called sloping shoulder, it tends to come into contact only with the portion near the acromion point. Therefore, the load of the bag tends to concentrate on the portion near the acromion point. Thus, with the shoulder belt according to the comparative example, it is difficult to widely disperse the load between the neck side point and the acromion point depending on the inclination angle.

In contrast, the shoulder belts 10L, 10R, and 10 according to the present embodiment include the third portion 3, and the expansion ratio of the third portion 3 is higher than the expansion ratio of each of the first portion 1 and the second portion 2. high and the bending resistance of the third part 3 is lower than that of each of the first part 1 and the second part 2 . Therefore, the third part 3 is easily deformed in the lateral direction and in directions perpendicular to the longitudinal direction and the lateral direction, and the first part 1 and the third part 3 are deformed in the lateral direction and the directions perpendicular to the lateral direction. A relative positional relationship between the two parts 2 can be easily changed.

As shown in FIG. 7, when the shoulder belts 10L, 10R, and 10 according to the present embodiment are worn by a wearer with a relatively small angle of inclination, that is, a so-called anchor shoulder, the first portion 1 is positioned at the acromion point. The second part 2 can contact the vicinity of the cervical point. Further, as shown in FIG. 8, when the shoulder belts 10L, 10R, and 10 according to the present embodiment are worn by a wearer with a relatively large angle of inclination, that is, a wearer with a so-called sloping shoulder, the first portion 1 is contacts the portion near the acromion point, and the second portion 2 can contact the portion near the neck side point. As described above, according to the shoulder belts 10L, 10R, 10 of the present embodiment, the load can be widely distributed between the neck side point and the acromion point regardless of the inclination angle. 7 and 8, only the first part 1 and the second part 2 are schematically illustrated.

FIGS. 9 and 10 and FIGS. 19 and 20 are diagrams showing load distributions on the shoulders of the same wearer, measured under the same conditions, for each of the shoulder belt 10L and the shoulder belt according to the comparative example. . The wearer had sloping shoulders with a relatively large angle of inclination as shown in FIGS. Load distribution was measured using a flexible piezoelectric sensor fixed to the wearer's shoulder. Corners A and B of the measurement area shown in FIGS. 9 and 19 correspond to angles A and B of the measurement area in FIGS. 9 and 19, the right side is the cervical point side and the left side is the acromion side. 9 and 19, the upper side is the wearer's back side, and the lower side is the wearer's chest side. In FIGS. 9 and 19, the area where no load is applied is shown in the same color as the background color (the color of the area outside the two inclined lines), and the color shading of the other areas is different. It shows the magnitude of the load applied to the area. In FIGS. 10 and 20, the heights and color shades of a plurality of rod-shaped data protruding outward from the body surface indicate the magnitude of the load applied to the region. In FIGS. 9 and 19, the slanted line located on the right side indicates passing through the cervical point, and the slanted line located on the left side indicates passing through the acromion point.

As shown in FIGS. 19 and 20, in the shoulder belt according to the comparative example, the load is concentrated in the vicinity of the acromion point, and a relatively large load is applied to the area where the load is applied. was

On the other hand, as shown in FIGS. 9 and 10, in the shoulder belt 10L, the load is dispersed in the vicinity of the neck point and the acromion point, and the load is applied to a plurality of areas. was smaller than the maximum load measured on the shoulder belt according to the comparative example.

As described above, it was confirmed that the shoulder belts 10L, 10R, and 10 according to the present embodiment can follow the complicated three-dimensional shape of the body in the static state as compared with the shoulder belt according to the comparative example. .

Next, with reference to FIGS. 11 to 16, the effects of the shoulder belts 10L, 10R, 10 when the wearer's shoulders and arms are in a dynamic state will be described.

11 to 14 are diagrams for explaining that the distance between the neck side point and the acromion point varies in the above dynamic state. As shown in FIG. 11, a first state P1 in which the arm is lowered, a second state P2 in which the arm is raised along the horizontal direction, and a state P2 where the arm is raised along the vertical direction. Consider a third state P3.

As shown in FIGS. 12 to 14, the distance L2 between the neck side point and the acromion point in the second state P2 (see FIG. 13) is the same as the neck side point and the acromion point in the first state P1. , and longer than the distance L3 (see FIG. 14) between the neck side point and the acromion point in the third state P3.

Table 1 shows individual differences in the distances L1, L2, and L3. For each of the six subjects, the distances L1, L2, and L3 were measured, and their rates of change were calculated.

As shown in Table 1, distance L2 was shorter than distance L1 and longer than distance L3 for all subjects. In addition, the ratio (L2-L1)/L1 was 30% or more in absolute value in all subjects, and the ratio (L3-L1)/L1 was 50% or more in absolute value in all subjects. In other words, in all subjects, it was confirmed that the distance between the neck side point and the acromion point changed greatly when they were in the above dynamic state. Further, individual differences were confirmed in each of the distance L1, the distance L2, the distance L3, the ratio (L2-L1)/L1, and the ratio (L3-L1)/L1.

According to the present embodiment, as described above, the third part 3 is provided, the expansion ratio of the third part 3 is higher than the expansion ratio of each of the first part 1 and the second part 2, and the third part 3 is lower than the bending resistance of each of the first part 1 and the second part 2 . Therefore, the third part 3 is easily deformed in the lateral direction and in directions perpendicular to the longitudinal direction and the lateral direction, and the first part 1 and the third part 3 are deformed in the lateral direction and the directions perpendicular to the lateral direction. A relative positional relationship between the two parts 2 can be easily changed. Therefore, the shoulder belts 10L, 10R, 10 according to the present embodiment can follow changes in the three-dimensional shape of the body in the above dynamic state.

As shown in FIG. 15 , in the second state, the third portion 3 of the first region 11 that is in contact with the shoulder extends linearly in the lateral direction. The continuous first part 1 and second part 2 can be opened in the lateral direction. On the other hand, as shown in FIG. 16, in the third state, the third portion 3 of the first region 11 that is in contact with the shoulder is bent downward in a convex shape, thereby The first part 1 and the second part 2, which are continuous with the third part 3, can also bend downward in a convex shape. Therefore, in the third state, compared to the second state, the first portion 1 and the second portion 2 can be closed in the lateral direction. In this way, in each of the second state and the third state, the first regions 11 of the shoulder belts 10L, 10R, 10 can follow changes in the three-dimensional shape of the shoulders. The area becomes wider.

Also, as shown in FIGS. 15 and 16, the second region 12 that passes under the armpits is the first region 11 that is in contact with the shoulder in the second state and the third state. shows the opposite behavior. Specifically, as shown in FIG. 15, in the second state, the third portion 3 of the second region 12 passed under the armpit contracts in the lateral direction. As a result, in the second state of the shoulder belts 10L, 10R, 10, while the second region 12 sufficiently secures a contact area with the flanks, it is difficult for the shoulder belts 10L, 10R, and 10 to bite into the flanks and interfere with the arms and flanks. . On the other hand, as shown in FIG. 16, in the third state, the third portion 3 of the second region 12 passed under the armpit extends along the width direction. As a result, in the third state, the shoulder belts 10L, 10R, and 10 ensure a sufficient contact area between the second regions 12 and the flanks, so the behavior of the bags 100 and 110 is stabilized in the dynamic state. .

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all changes within the scope and meaning equivalent to the scope of the claims.

1 first part 1a, 2a core material 1b, 2b packaging material 1b1, 2b1 surface part 1b2, 2b2 back surface part 1b3, 2b3 outer edge part 2 second part 3 third part 3a first part, 3b second portion 3c third portion 5 connecting member 6a, 7a sewing member 10, 10L, 10R shoulder belt 11 first region 12 second region 13 third region 14 fourth region 100 , 110 bag, 101 body housing, 102 tape.

Claims (4)

A shoulder belt having a longitudinal direction and a lateral direction intersecting the longitudinal direction,
a first part and a second part that are spaced apart from each other in the transverse direction in a cross section that intersects the longitudinal direction;
A third part connecting between the first part and the second part,
The expansion ratio of the third part is higher than the expansion ratio of each of the first part and the second part,
The bending resistance of the third part is lower than the bending resistance of each of the first part and the second part,
each of the first part, the second part, and the third part is a member independent of each other and extends along the longitudinal direction;
each of the first part, the second part, and the third part from a first region intended to contact the shoulders and upper chest of the wearer wearing the bag with the shoulder belt; extending to a second region intended to contact the wearer's flank,
A fourth region is formed at one end of the shoulder belt and located on the opposite side of the first region to the second region in the longitudinal direction,
one longitudinal end of each of the first portion, the second portion, and the third portion is connected to the fourth region;
A shoulder belt, wherein the other ends in the longitudinal direction of each of the first part, the second part, and the third part extend to the other end of the shoulder belt. The third part comprises a first part arranged inside the first part and connected to the first part, and a first part arranged inside the second part and connected to the second part. and a third portion disposed externally of said first portion and said second portion and connecting said first portion and said second portion. The shoulder belt described in . each of said first part and said second part comprising:
a core material arranged so as to overlap at least part of the first portion or the second portion in plan view;
The cross section includes the first portion or the second portion, and a wrapping material arranged to surround the core material and fixed to the first portion or the second portion. 2. The shoulder belt according to 2. A shoulder belt according to any one of claims 1 to 3;
and a main storage unit fixed to the shoulder belt.

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